Submarine signaling apparatus.



1 SCHIESSLER 'SUBMARlNE SIGN'AUNG APPARATUS.

y APPLICATION FILED FEB. 8. 190B- r 1,294,826. Q Patented Nov. 14,1916.

4 SHEETS-SHEET l.

JJA

Inventr.

Witnesses.

'1. ScHlEssLER.

y SUBMARINE SIGNALING APPARATUS. APPLICATON FILED FEB. 8. |908. 1,204,826. Patented N0v.'14, 1916.

4 SHEETS-SHEET 2.

I l. SCHIESSLER.. SUBMARINE SIGNALING'APPARTUS. APPLicATIoN HLED rss. s. 190s.

1204,82@ i .Patented Nov. 4 16.

4 sains-s a.r

Witnesses.

I. ScIIIEssLER. Y

SUBM'ARINE SIGNALING APPARATUS.

APPLICATION FILED FEB. 8, 190s.

1I ,204,826 Patented Nov. I4, 1916 4 SHEETS-SHEET 4.

ill 'I Ig. Y

I I I l I I I I I I l I l l l I I I I I I I l I@ a I I I l I l l I "j Witnesses. Qua 7( om JOSEF SCHIESSLER, OF BADEN, NEAR VIENNA, AUSTRIA-HUNGARY.

SUBMAEINE SIGNALING APPARATUS.

Specification of Letters Patent.

. .Patented Nov. 14,1916.

Application led February 8, 1908.- Serial No. 414,99'8.

To all whom it may concern vBe it known that I, JOSEF SCHIEssLER, a subject of the Emperor of Austria-Hungary, residing at Baden, near Vienna, Austria- Hungary, have invented certain new and useful Improvements in Submarine Signaling Apparatus; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters`or gures of reference marked thereon, which form a part of this specification. Y a

The object of the invention is to provide a new or improved submarine signaling apparatus, the purpose of which is-1. To determine the position of a submarine source of sound according to the indications on a mariners compass card, as well as to also determine the distance 'of such source of.l

sound from the place of observation and to immediately transmit the indication or intimation toivarious other places. 2. To determine the speed at which a source of sound approaches toward or recedes from the place of observation. 3. To enable signals or spoken sounds to be transmitted under water. The apparatus being such thatf in such operations the manipulations necessary to` be effected by hand are reduced to a minimum. For this purpose there is arranged at the place of observation, such as a ship, lighthouse, etc., a receiver provided with a movable lsound seeker which isplaced under Water and` which converts sound wavesentering or caught up by it into corresponding electrical waves` that first set up fmechanical oscillations in theV membrane, diaphragm, or thelike, suitably'arranged to receive them. By means of an optical arrangement and a body the conductivity of which varies under the action of light,.such

for example as selenium, these mechanical Aoscillations control an electric lsignaling cir- Y l the bottom l4 of the ship, and to this bottom cuit, or the operations of an acoustic signa At the same time the. electrical waves produced bythe sound waves entering the ap- 4paratus f .are 'again convere'd" into sound waves by a telephonie arrangement, the 'air wavesfthereby produced being` adapted to act, if necessary, upon a device whereby the pitch' of such waves, or the number of oscillations 'corresponding to such-pitch, can be determined. In order', however, should itbe desired to do so, to transmit sound waves corresponding to a certain pitch, or spoken sound agreed upon in the service, the apparatus may include a transmitter capable of adjustment in any desired direction, and which is adapted to impress upon the water the sound Waves produced either bya sound producer, such as a siren or the like, or by spoken sounds, so that such sound waves may be picked up by a receiver of the kindhereinbefore referred to.

A construction of submarine signaling apparatus embodying this invention is illustrated in the accompanying drawings-' a Figure l shows in central vertical sectionl the receiver placed under water in combination with the indicating apparatus arranged above the water upon a ship, lighthouse, or other position. Fig. 1a is a view, partly in section, of a modiedarrangement of the sound seeker provided with a solid receiving cylinder. Fig'. 1'J is a sectional view of the contact devlce similar to Ampres frames. Fig. 2 showsthe indicating apparatus in plan. Fig. 3 shows, in vertlcal section, the apparatus for automatically giving the signal and determining the pitch. Fig. 4 shows the arrangementof ,electrical connections for all parts of the apparatus comprising the receiving device.I

A indicates the receiving apparatus, comprising a sound seeker 1` adapted -to ,be placed underwater and 'capable of being rotated about a vertical axis."- It may with advantage have the form of an ellipsoid and is fixed a bearing 5 in which the tube canrotate.'

Plrojecting --into the sound seeker .1 is an elastic metalgtle 'or cylinder 6 the inner end of whichis'clo d; and the outer en'd of which is open to the outer water in which the Adevice is located.l Instead of the body 6 being tubular, as shown, it may in some cases be formedas a solid rod or cylinder made of elastic material. In `this case the outer end rof the solid metal cylinder 6', Fig. l, is

formed with a' circular or .other suitably shaped head p whichfis packed or tightened against the ends of the vseveral insulating layers g by a washer. of india-rubber or other material 'not liableuto be attackedjby sea water. In any caseits lexternal periphery is t in, 1nd

insulated from sound, as by an. india-rubber sheath 7, a lead tube 8,-an india-rubber-tube 9 and finally separated from the surrounding space by a brass-tube 10. lTheinner end of The chamber 11;rests upon a sound-proof for sound damping foundationconsisting for example,lof layers of india-riibber `18, wood 20, and india-rubber21;.the microphone casing is likewise lseparated from the e wall of the chamber by sounddamping ma- -pressure than the".surrounding;,med1

teria-l, so that conduction of sound through the wall of thesound seeker 1 and the wall of the chamber 11 is or prevented.

For the purpose of increasing the sensitiveness of the microphone 15 the chamber 11 may be filled with a gas'under a. higher The tube 3 is `rotated ata uniform speed t in any suitable manner, say by means of j es ,bevel gear wheels 22, 23, from a shaft 24 driven by any appropriate motor, the arrangement being such that immediately the tube or the like vcrosses the path of sound waves they enter lit and are picked up by the receiver. y

The receiving apparatus A is in direct communication with anv indicating apparatus'B situated above the water.

The upper portion ofthe" tube 3, which in the example given is made separate from the remainder, andisfsuitably connected thereto, (althoughit maybe made in one piece therewith,) passes through the casing 25 of the indicating apparatus, in the cover of which is fitted a ground glass disk 26 having'division marks 27 thereon, see Fig. 2. A mark 28 running in the direction of a diameter of the graduated circular disk- 26' indicates the position of the axis 'of the ship to which the a paratus 'is -fitted, in -a ,manner similar to `t atof,y a marmers compass. The outer end l of the upper part ofthe. tube 3 is V'fitted with a pointer 34which moves-over the divisions 27 and is so arranged that-it always indicates the position 'and direction of the tube' 6 ofthe sound seeker 1.

A ring 29 of insulating material, Fig. 2, which surrounds the graduated disk 26 carries plug sockets 30 for a plug contact 31, the said sockets corresponding to the main divisions ofthe `disk 26. The flexible conductor 32connected to the plug contact 31 is conf nected with one conductor 33 of an electrical' circuit the. second conductor of which is connected to all the plug sockets 30. In this circuit, whichmay be supplied with a curfrent of'electricity from any desired source,

are inserted indicators arranged in the usual lway, and located at allthose points of the ship, lighthouse, etc. where the indication is desired. c Y Y In'the casing 25 are arranged glow lamps for thepurpose of enabling the disk 26 to be illuminated from beneath.'

vTo enable the signal to be given automatically when sound Waves enter and are received by the receiving apparatus A and the pitch-of the sound waves or distance of the approaching or receding sourcev of sound to .be determined, the apparatus A is also electrically connected with an apparatus C, s ee Figs. 3 and 4. For the'purpose of producingftliis electrical connection there are fixed upon the tube 3 two conducting disks 35 and 36, which are insulated therefrom and from each other, and are polished to a high degree of brilliancy, and which are connected to the conductors 14 and 17 leading from the microphone 15.

Rubbing contact springs 37 and 38 are arranged to bear upon the two disks 35 and 3.6, and these yspr-ings are connected by con- :luctors '39 and 40 with the primary coil 41,

Fig. 4, of an induction apparatus z" vsghich forms a constituent of the apparatus C and which is inclosed in a light-tight closed b ox 42, see'Fig. 3.

In the' circuit of the microphone 15 is included a battery b see Fig. 4.

In place of the metal disks 35, 36, with the rubbing Hcontacts 37 38, contact stirrups may be employed which move in an annular mercury trough after the manner of A mpres frames. This device consists of two concentrically arranged ring-shaped f metal troughs, 35', 36 Fig. 1 insulated from each other,'the said troughs being secured to the tube 3 of the sound seeker 1 by means v"of a support or carrier 21 common to both of them, so that they will rotate with the tube 3. V.The troughs 35,36 are filled' with mercury and connected vby means of the conducting wires 16, 17, to the microphone 15 ofthe sound seeker. Metallic contacts 37', 38', that dipinto the mercury in the troughs, arei cnnected to the conducting wires 39 an f In the front wall of the light-tight box 42 A is an opening 43, which, with the exception ofl,a small-orifice, is entire] covered by an 'opaque diaphragm 44. In ont of the dia- `phragm and outside of' the box is placed a glow lamp 45, and behind the diaphragm and inside the box is a bi-convex lens 46, one focus of which lies in the opening of the diaphragm 44, so that light rays falling upon the lens 46`emerge from the lens in the"form of a parallel pencil of rays 47. The pencil of light rays 47 falls upon a small concave mirror' 48, which is formed entirely of iron and is held by three magnetic points 49, 50 and 51, arranged triangularly a short distance from each other, see Figs. 3 and 4. Two of these points (49 and 50) are attached to the poles of a powerful magnet 52, while the third point 51 is mounted upon a small lever 53, which is connected to the diaphragm of a telephone 54, sothat when the diaphragm vibrates, its movement to an increased extent is transmitted to the mirror 48, so that such mirror is caused to oscillate about the` axis formed by the two other points 49 and 50,

The telephone 54 is electrically connected to the secondary coil 41 of the induction apparatus z', Fig. 4, by conductors 55, 56, and advantageously over one or more condensers 57.

`When the mirror 48 moves,the pencil of rays 47 reflected therefrom falls through a' tube 58 onto a selenium cell 60 arranged in the end or cover plate 59 of the tube and' insulated therefrom, which cell is included in the circuit 61, 62, of a battery 63. The

circuit 61, 62, also includes a polarized relay 1' which serves to close a second circuit 64 which includes a bell battery 65, a bell 66 of the usual kind, and a hand switch 67..

In a shunt 68, 69 of the circuit 55, 56, is inserted a second telephone 70 which is mounted upon the cover of the box 42 and outside it. This shunt circuit 68, 69 may be made and broken by means of a hand switch 71, which may be so combined with the hand switch 67 that when the shunt circuit 68, 69 is closed the conductor 64 is broken, andv vice versa.

Opposite the telephone 70 and on the cover. of the box 42 is mounted a resonator n which consists advantageously of two 'parts 72 and 73 adapted to slide telescopically, and of which one, 72, is stationary, while the other, 71, is movablev along a guide 74, so that by increasing or diminishing the internal Space of the resonator n it can be adjusted for resonance within certain limits. The particular number of oscillations for each adjustment of -theresonator may be read oil from an empirically determined series of divisions a marked on the movable part 73 of the resonator. In order, however,

to enable this resonator to be not only adj'usted, but also its actionto be seen, the outlet nozzle 75 thereof rojects into a casing `76, Fig.v 3, which is c osed at the top by a 35 transparent glass plate 77, an contains within'it a disk 78 graduated with ydivision marks a circular row, over which moves a pointer that is mounted upon a spindle 79 capable of easily rotating. To the spindle 79 is connected one end of a thin clock spring 81, which -`surrounds it, the other end of the spring being connected to the internal Wall of the casing. Upon the spindle 79 is mounted a 'small fan wheel 82 which may with advantage be made of mica, and which is set in rotation by the air emerging from the nozzle 75 when thev resonator n responds. of thel pointer 80 indicates the maximum intensity of the tone or resonance. The delection of the pointer does not show the tone' pitch but shows only the intensity of the tone. It is true that this intensity per se, maybe due to different causes. But with one andthe same resonator the maximum deiection of the pointer shows that during the shifting of the regulable resonator, resonance has finally taken place and that the tone at which this resonance has taken place is the proper one. Consequently the observer can deduce the intensity of the tone from the maximum deiection of the pointer 80. v

The. apparatus C also enables the speed to be determined with which a source of sound, which produces a tone of definite pitch, approaches toward or recedes from the observer.

The operation of the apparatus comprising the mechanism A, B and C, is, assuming a ship to be the place of observation, as followsz-The receiver A, that is to say the sound seeker 1, while surrounded on all sides outside the hull of the ship by water, and accessible on all sides to sound'waves, is slowly rotated about its axis 3, so that, assuming there is a sound proceeding from -a distant source, at one po1nt of its rotation the receiver will assume a position in which the sound tube or cylinder 6 of the receiver will extend directly in the direction' of the distant source of sound. Such sound will. y then be at its greatest-intensity relatively to the receiver and the microphone 15 will be then excited toI its greatest extent. The fluctuations of current produced thereby are transmittedv by the conductors 16,17', the

.rubbingcontacts 37, 38 or the mercury contacts replacing them, and the conductors 39, 40, to the primary coil 41 of the induction apparatus i. When the microphone rey sponds an alternating current is induced in thesecondary coil 41 of the induction apparatus, and the effect .of this current is increased by the condenser 57, and acts upon the telephone 54 and sets its diaphragm to vibrating, such vibrationsbeing transmitted to an increased extent through the lever 53 to the mirror 48. The vibrating mirror 48 throws the pencil of light 47 onto the se- The greatest movement lenium cell 60, which thereupon permits the current from the battery 63 to ow through the conductors 6l, 62, and the relay r, which latter closes the circuit 64 of the ringing apparatus 66. If'the ringing apparatus then be cut out by means of the switch 67 and the switch 71 be closed, the circuit 68, 69, of the sponding thereto. In this way,- as herein-V before described, the circuit 32, 33, is closed,l andthe position of the pointer 1s* thereby signaled to all those points of the ship, such as steerin house, torpedo room, etc'., iin which the lndicators hereinbefore mentioned are arranged. If the telephone 70 reproduces a sound roduced artlcially from the distant source y a bell, a siren, a buzzer, or

f the like of a definite number of vibrations,

and not a noise produced in a natural way,

such, for example, as that of the ships screw in motion, the speed of the approachlng or receding source of sound can be easily calculated according to the well known Doppler principle, as when a source of sound,

'case is the submarine signaling which p of vibrations is ap roached, a higher tone 1s perceived-,xandw en the source of sound recedes, a deeper-one. l

With the arrangements hitherto used, it was only possible to determine in which direction a source of sound was to be found, and at the utmost, whether this source of sound was approaching or receding from the observer.

By means of the apparatus hereinbefore described not only the direction but also the distance and the speed of a` moving source p of sound can be determined by calculation, as the necessary data are supplied by the ap aratus described.

v c calculation of the speed of the source ofsound relatively to the observer is made by means of the well known Doppler princlple. The source of sound in the present p aratus of a ship or offa light-house or ligg -ship, as the case may be. For this urpose an apparatus is necessary, which a ows exact determination of the increased number of vibrations, in case the source of sound is approaching, or of the diminished number of vibrations in case the source of sound is from the observer. This apparatus co asdescribed, of a lvery sensitive telephone 70, Fig. 4 by means of which the tone collected b the sound detecting device A is rep uced. In the immediate ucesgatone of a definite number vicinity ofthis telephone is arranged an adjustable cylindrlcal resonator n, n', on the/adjustable part of which isprovided a scale on which the diierent number of vibrations corresponding to tones in proximity to the normal tone emanating from the source k.of sound are marked. -As it is sometimes diiiicult to rely upon the sense of hearing of the observer, an indication is provided, consisting of a small fan wheel 82 of a verysmall weight, preferably made of' mica or other such material, the axis .79 of which turns on points. The axis carries a smaller pointer movable on a disk 78 whichis fixed by means of a small clock spring. If the sound propagated in the sea water is reproduced 1n .the telephone 70, the tone produced by the diaphragm of said telephone is reinforced, by means of the resonator and the air vibrations turn the small fan wheel. The deviation of the wheel is greatest when the resonator is adjusted to resonance. On the adjustable part of the resonator the number of vibrations with which resonance is obtained may be read on the scale. If the number of vibrations of the tone .received at the observation point is thus determined, the speed of the source of sound, relatively to the observation point may be ascertained.

If N bethe number of vibrations of the tone receivedat the observation point, and is indicated by the instrument, and if nbe the'number of vibrations of the tone produced at the source of sound, which of course must be known to the observer, and .s the speed with which the source of sound approaches or recedes, and is unknown and to`be determined, and e the velocity with which the sound is propagated in water `equal to 1435 per second, then the well known Doppler principle is expressed by the formula:

s N 1 E) if the observer approaches the source or' sound. i

' From this formula s may be calculated If, on the contrary, the observer recedes from the source of sound the signs are reversed and the Doppler formula is N(1 i) c from which the s v however, the source of sound (a s'ignahng ship) approaches the observer (supposed to be on a land station, or on another ship) the Doppler formula reads y e.s froml which the unknown speed s of the source of sound may be calculated.

In case the source of sound recedes from the observer, the -Doppler formula is cn Nm and the speed s is' (n-N) s As will be clear from the above statement, the speed can 'be immediately calculated by means of the indications given by the described apparatus if n, the number of vibrations of the tone produced by the submarine signaling device is known, as is the case with light-ships, or light-stations,or with ships having made a special arrangement to this eHect. It is furthermore of advantage to write on the scale of the adjustable resonator not only the number of vibrations, but directly the speed per hour, as the limits between which the speed of. a ship varies are very narrow, for a given type of ship.y

From this speed the type of ship in question may be immediately deduced, as the normal speed of different types has a determined value. LFor instance, a mail steamer has a speed of 10 knots per hour; a battle ship 18 knots; a cruiser or an express steamer 20 knots, and a torpedo vessel 30 knots. If bythese means the velocity of the source of sound or of the observer is determined, the distance may be easily ascertained.

As the sea water is a good and uniform sound conductor, the range of audibility of the signals is a constant one for one and the same apparatus. If this range of audibility is known and is, say 50 km. it is clear that at the moment the annunciator device operates, the distance is equal to the radius of lsaid range of efficiency.

If the moment at which the annunciator device operates has been noted, and thel speed with which the source of sound or the observer moves has been .calculated according to the Doppler principle, the distanceat any 'ven moment can be determined.

Let yS be the maximum and constant range of audibility of the signalsgl), the distance between the source of sound and the observer to be determined; s, the velocity ofthe ship; t, the time; then whereby the distance at every moment can be determined.

y I claim:

1. A receiver for submarine signaling apparatus, comprising asub-aqueous casing, a sound detecting element therein set into vbration by transmitted sound waves, a/resonator cooperating therewith and producing alr vibrations corresponding thereto, a microphone producing fluctuations of current corresponding to said air vibrations, means to annunciate the incoming of sound waves, a telephonic arrangement capable of reproducing'the sound waves picked up by the detecting element, means to rotate the casing in the direction of the incoming sound waves, an indicating device indicating the direction in which the casing has been rotated and means to determine the number of vibrations of the transmitted sound waves.

2. A receiver for submarine signaling apparatus, comprising a sub-aqueous casing, a

waves, a microphone producing fluctuations of current corresponding to said air vibrations, an annunciator device for indicating the incoming sound waves, a telephonic ar rangement to reproduce the sound waves picked up by the detecting device, means to rotate the casing in the direction of the incoming soundwaves, an indicator device indicating the direction in which the casing has been rotated, and means to determine the number of vibrations of the reproduced sound waves.

3. A receiver for submarine signaling apparatus, comprising a sub-aqueous casing, a sound detecting tube closed at its inner end and insulated from the casing, a chamber contained in said casing into which the closed end of said tube projects, said Vchamber filled' with a gas under a pressure greater than that of the surrounding medi/m and sound insulated from the casing ai'''sonator mounted on the closed end of the tube, coperating therewith and Aproducing air vibrations corresponding to the sound waves, a microphone structure producing fluctuations of current correspondmg 'to said alr vibratlons, an annunciator device indicating the incoming sound waves,

telephonic means to reproduce the sound waves picked up by the detecting device, means to determinethe'number of vibrations of said sound waves, means to rotate the casing in the direction of the incoming sound waves, and an indicator to indicate the. direction inwhich the casing has been rotated.

4. A receiver for submarine signaling ap- 130 reproducing acoustical Waves` correspomi-v indicator to determine the direct paratus, comprising a subaq'ueous casing, a sound detecting element' therein set into vibration by transmitted sound Waves, a

resonator coperating therewith and producing air vibrations corresponding thereto,

a microphone producing fluctuations of current corresponding to sald fal'rY vlbrations,

,an annunciator for indicating the incoming sound Waves picked up by the detectingl ele;- ment, means to indicate when vsaid rvsound waves are of maximum intensity and the number of their vibrations, a tubular support for the casing, a gear mechanism to rotate the tubular support' and theccasing with a constant' speed, and. a hand" `'connected Wwith said rotating'support ndicat-f ing the position o the sound' d eteetingeleI ment. '-I 5. A recelver for' submarine slgnalingjgap;

aratus com risin a sub-a ueous--Y-casln a sound detecting element thereinsetintoA vibration by transmitted sound? waves; a' resonator coperating therewith andp'ro-.f` ducing air vibrations corresponding'ther'eto, a microphone producing `fluctuations o frcur-' rent corresponding `to said Y airkvibrations Y an annunciator indicatingthe-incoming o sound waves, means to rotate Vthecatsing, an-

indicator to determine the directionin"I which the y'casing is rotated;y (telephonie means connected to said microphone` andv ing to the current fluctuations"-anad'ustf able resonator in proximity to tbe'telep one capable of bein adjusted and tunedto resonance therewit and means adjacent .said resonator and acted upon by the vibrations therefrom to indicate the number of vibra-v tions of the tone received and thereby determine the speed of the source of sound.'

6.. A receiver for submarine signaling `apparatus comprising a sub aqueouscasing', a sound detecting element therein set into vibration by transmitted sound waves, a resonator coperating therewith and producing air vibrations corresponding thereto,

a microphone producing fluctuations of cur`r rent correspondin to saidv air vibra-tions an annunciator in eatingv theincoming of sound waves, means to rotate'the casing, an.

ion--o the sound waves, telephonie vmeans connected to said microphone and reproducingjacoustical waves co ondin tol thel current iluctuations, ,an a justa'b e resonator having an airl outlet nozzle in proximity vto the telephone capable of being adjusted and tuned toA resonancetherewith,y a fanv wheelV pivotally mounted in prom'mity to the nozT zle of said resonator, a spring to control the movement of said fanl wheel 'and anv indicator thereon to indicate the of rotation of the wheel. -7. A receiver for submarine apairvibratio'ns correspon paratus, lcomprising a v vsub-aqueous casing, a sound detecting element therein 'set into lvibration by transmitted sound waves, -a

resonatorgvcoperating. therewith and producing airfvi'brationscorresponding thereto,

a microphone,l in coperati've relation' there-- with produclng'fluctuatlons of current corresponding tov said air vibrations, telephonie 'means toreproducethelsound waves picked' up by the detecting'devicegindicators, to

determinethenumbe'r o ijvibrations and the direction of *said sound-Waves and a secondy telephonie means in 'parallel vvith the first to operate an;annunciatingdevice.

paratus',. 'com-prism ubaqueous casing,

transmise a 1mi l ro h" eu lncoopcrativej relation therewith. andfproducing guctuations ofcurrent correspon ing-'fito' 'Sai "air' vibrations, tele'- phonicimea'nsto Qrepr ucegfthe sound `waves pickedjup by thev yde "ting-felemcntl indi-1 caters to determine-1 v telelllonic.;'n 'leansv andati Itmpnci'ator device arranged-mz said circuitytoloperate when.

soundwaves enter l the vd'etecting, element.

A receiver' for, submarine' signaling apparatus fcompri'singfa sub=aqueous casing, a sound brat'ior by' -Athe4 transmitted-Sound waves, a'

resonator `co,peraltingtherewith and' produing air vib` tions correspondin'gfthereto,a

Y l c vof-vibra tlonsjand tbe'fdirection of 'the incoming la @detecting elem nty therein setv into,

' sound waves, a erewith and pro respondingthereto,

micropliolxem coperative relation therewith and' roducing' fluctuations ofcurrent correspon 'ngzitoisaid :air vibrations, telephonic;v means t'oreproduce ithe. -sound waves picked up by the .detectin' element, indicators to determine the-n f "r of vibrations. andthe"direction'of waves, aseondtelephonic .paralle with the first, a circuit independent .of the first telephonic means -including'a selenium cell andv v sound detecting elementtherein set into v1- bration-by transmitted sound waves, a resonator coperatingtherewithand p ucing t reto, a m1- crophone in coperative 'ontherewith Vparams,-comprisinga. sub-'aqueous casing, a

and producing fiuctuations of current corresponding to said air vibrations, a telephonie means to reproduce the sound Waves picked up by the detecting element, indicators to determine the pitch and the direction of said incoming waves, a telephone in parallel with the first, a circuit including a selenium cell and a relay, a permanent magnet, a metallic mirror magnetically held to said magnet, a lever arm operated by the diaphragm of the telephone, a source of light projecting itsA termine the maximum intensity of the sound received and thereby the direction of said source of sound, means to convert the acoustical oscillations of said resonator into similar electrical oscillations, means for transforming said electrical oscillations into similar light vibrations, means to re-transform said light vibrations into reinforced electrical vibrations, means to produce acoustical vibrations Yfrom said retransformed electrical oscillations, and means to determine the pitch or number of vibrations of said latter acoustical vibrations.

12. A sub-aqueous signaling system comprising a sub-aqueous sound conductor' responsive to a musical tone, a resonator connected thereto, and through which said tone is vfiltered, means actuated by said resonator responsive to said tone for producing electrical vibrations of the same frequency, and a receiving apparatus responsive to and operated by said synchronous electrical vibrations.

13. A sub-aqueous signaling system comprising a sub-aqueous sound conductor responsive to a musical tone, a resonator connected thereto and through which said tone is filtered, means actuated by said resonator responsive to said tone for producing electrical vibrations of the same period, a telephone operated by said electrical vibrations, a regulable resonator coperating with said telephone Whose adjustments for resonance are a measure of the increase or decrease of the number of vibrations of Vthe tone received, and a scale to indicate the vibrations of the tone received and when the resonatorv is adjusted.

In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribing Witnesses.

DR. JOSEF SCHIESSLER.

Vitnesses JOSEF RUBARCHOE, AUGUST FUGGER. 

